EP0063771A1 - Système pour compensation pendant des années bissextiles - Google Patents

Système pour compensation pendant des années bissextiles Download PDF

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Publication number
EP0063771A1
EP0063771A1 EP82103270A EP82103270A EP0063771A1 EP 0063771 A1 EP0063771 A1 EP 0063771A1 EP 82103270 A EP82103270 A EP 82103270A EP 82103270 A EP82103270 A EP 82103270A EP 0063771 A1 EP0063771 A1 EP 0063771A1
Authority
EP
European Patent Office
Prior art keywords
year
data
leap
leap year
dominical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82103270A
Other languages
German (de)
English (en)
Other versions
EP0063771B1 (fr
Inventor
Kowji Tanikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP56060781A external-priority patent/JPS57175278A/ja
Priority claimed from JP56060782A external-priority patent/JPS57175279A/ja
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to AT82103270T priority Critical patent/ATE17892T1/de
Publication of EP0063771A1 publication Critical patent/EP0063771A1/fr
Application granted granted Critical
Publication of EP0063771B1 publication Critical patent/EP0063771B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G99/00—Subject matter not provided for in other groups of this subclass
    • G04G99/006—Electronic time-pieces using a microcomputer, e.g. for multi-function clocks
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/08—Visual time or date indication means by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques
    • G04G9/12—Visual time or date indication means by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques using light valves, e.g. liquid crystals
    • G04G9/124—Visual time or date indication means by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques using light valves, e.g. liquid crystals provided with date indication

Definitions

  • the present invention relates to a leap year compensation circuit for a digital watch and, more particularly, to a leap year compensating circuit for a digital watch which multifunctionally uses time and date information.
  • Digital watches have recently been assembled in various devices. Along with time information of the digital watch, operating conditions of these devices are controlled. As an example, information such as date and time of issuance of a bill to a customer may be displayed.
  • the digital watch has been widely utilized in a variety of applications.
  • a one-chip wristwatch-type LSI which is directly connected to a display element is not suitable for the above applications.
  • a simple LSI for a digital watch which combines counters is used for the above purpose. With the LSI of this type, compensation for a short month (consisting of 30 days) and a long month (consisting of 31 days) can be performed. However, it can hardly compensate for a leap year.
  • dates may be displayed in the dominical year (AD) or in a Japanese era, that is, "Showa" (the first year of "Showa” era corresponds to 1925 AD).
  • Some devices display dates either in AD for export use or in the Japanese era for domestic use.
  • a leap year compensation circuit has been desired for some time.
  • a leap year compensation circuit for a digital watch comprising time counting means for generating date data including at least year, month and day, memory means for storing leap year data corresponding to a leap year table, comparing means for comparing the leap year data stored in said memory means and the date data generated by said time counting means, and leap year setting means for setting said time counting means to a leap year calender according to comparison results obtained by said comparing means.
  • Fig. 1 shows a block diagram of the main part of a leap year compensation circuit for a device which includes a digital watch.
  • a CPU 1, a ROM 3 and a RAM 4 are coupled by a bus 2.
  • the bus 2 is connected to an I/O controller 5 (to be referred to as an IOC hereinafter) and an electronic watch circuit (time counting circuit) 6.
  • the IOC 5 is connected to a leap year setting circuit 7 which comprises a flip-flop.
  • the leap year setting circuit 7 together with the time counting circuit 6 is powered by back-up batteries 8.
  • I/O devices 9 such as a display unit or a printer are connected to the IOC 5.
  • the ROM 3 stores leap year data corresponding to a leap year table shown in Fig. 2, a compensation program of the leap year compensation sequence, and a program for executing the operation sequence of the device. Data is read out from and written in the RAM 4 during data processing.
  • the mode of operation of the above device including the watch circuit 6 will be described with reference to timing charts of Fig. 3 and a flow chart of Fig. 4.
  • the device must be operated in a non-periodical manner as shown in Figs. 3(A) and (B).
  • the CPU 1 reads out date-time data, that is, data of 10 o'clock, 00 minute and 00 second on January 4, 1980 of the watch circuit 6 through the bus 2.
  • the CPU 1 compares the readout year data, that is, data of "1980" and leap year data of leap year table data (Fig. 2) stored in the ROM 3.
  • the CPU 1 judges whether or not the date represented by data from the watch circuit 6 corresponds to the date after February 29. Since the current date is January 4, the CPU 1 generates a signal from an output port 01 of the IOC 5 (Fig. 3(C)) through the IOC 5. In response to this signal, the flip-flop constituting the leap year setting circuit 7 is set. The output of level "1" is output from an output terminal Q of the flip-flop. This indicates that this year is a leap year but leap year compensation is not yet performed. In this condition, when power is cut off from the device and the device is inoperative, the watch circuit 6 and the flip-flop of the leap year setting circuit 7 are powered by the back-up batteries 8.
  • the watch circuit 6 continues counting time and the set status of the flip-flop is maintained.
  • the CPU 1 reads out date data from the watch circuit 6 and compares it with leap year table data and data of February 29. February 3 is prior to February 29, so the same operation as described above is repeated.
  • the CPU 1 judges that date compensation must be performed.
  • the output status of the flip-flop is then checked through the input port Il of the IOC 5. Since the flip-flop 7 is set, that is, since leap year compensation is not yet performed, the CPU 1 compensates for date-time data. In particular, the CPU 1 corrects time data on March 1 which is read out from the watch circuit 6 to time data on February 29 read out from the ROM 3, and supplies the corrected data to the watch circuit 6. Thus, data in the watch circuit 6 is compensated.
  • the watch circuit 6 counts time on the basis of compensated date. In this condition, the CPU 1 supplies the set signal shown in Fig. 3(D) to the flip-flop which is then reset. The reset status of the flip-flop is judged by the CPU 1 as the completion of leap year compensation.
  • date data is read out from the watch circuit 6 and is compared with leap year table data stored in the ROM. If date data corresponds to leap year data, the leap year setting circuit 7 is set to the leap year mode. Then, it is judged whether or not the current date is after February 29. If so, the watch circuit 6 is automatically set to the leap year mode. Leap year compensation is performed by a control circuit such as a CPU. The simple and discrete watch circuit of this type which comprises a counter is thus used for leap year compensation. An LSI for an electronic watch is not used.
  • the flip-flop which is powered by the back-up batteries is used as the leap year setting circuit 7.
  • a nonvolatile semiconductor memory or an electromechanical memory such as a latching relay may be used in place of the flip-flop.
  • the CPU includes a nonvolatile memory
  • this memory may be used instead of the flip-flop.
  • the watch circuit includes a leap year compensation circuit
  • the output from the output terminal Q of the flip-flop may be connected to a leap year setting terminal of the watch circuit.
  • the leap year is discriminated in dominical year.
  • the leap year may be judged on the basis of the Japanese era "showa”.
  • the current year may be judged by calculated leap year data instead of leap year table data.
  • next day after February 28 is defined as March 1 in the watch circuit.
  • the next day may be February 29.
  • the flip-flop may be set to increment the value of date data after February 28.
  • the leap year is judged in accordance with values in the dominical year or the Japanese era.
  • a leap year compensation circuit which arbitrarily judges the current year as a leap year on the basis of the dominical year or the Japanese era will be described according to another embodiment of the present invention.
  • the same reference numerals as in the first embodiment denote the same parts in the second embodiment, and a detailed description thereof will be omitted.
  • the CPU 1, the ROM 3 and the RAM 4 are coupled to the bus 2.
  • the IOC 5 and the watch circuit 6 are also connected to the bus 2.
  • the IOC 5 is connected to a display unit 9a and an input unit 9b.
  • the watch circuit 6 is powered by the back-up batteries 8.
  • the ROM 3 stores leap year data corresponding to a leap year table including leap years in the dominical year and the Japanese era, as shown in Fig. 6, a program for the operation sequence of the device, a leap year compensation sequence program and the like.
  • the CPU 1 controls operation of the device and leap year compensation according to the programs stored in the ROM 3. Data is read out from or written in the RAM 4 during data processing.
  • the watch circuit 6 is set to produce "showa era” time data. "Showa era” leap year data is read out from the ROM 3 and compared with time data stored in the watch circuit 6. If the time data corresponds to a leap year, leap year compensation is performed in the same manner as in the dominical year mode. Time data is thus renewed as data of 9 o'clock, 30 minutes and 00 second on March 22, 56. (The 56th year in the Showa era corresponds to 1981 AD.)
  • Fig. 8 shows a setting switch 9b-1 of the input unit 9b.
  • the setting switch 9b-1 When the setting switch 9b-1 is set to the "Dominical year” mode, a signal of level “1" is supplied to the IOC 5. On the other hand, if the setting switch 9b-1 is set to the "Showa era” mode, a signal of level "0" is supplied to the IOC 5.
  • the CPU 1 detects one of the signals, it judges that the mode is set to the "Dominical year” mode or the "Showa era” mode.
  • the flow chart for this operation is shown in Fig. 9. As is seen from this flow chart, after the time data is read out from the watch circuit 6 and the signal of level "1" is detected, dominical leap year data is read out from the ROM 3.
  • Fig. 10 shows changes in level at input terminals IN1 and IN2 of the IOC 5 in accordance with operation of the setting switches 9b-l and 9b-2 of the input unit 9b serving as the dominical year setting switch and the Showa era setting switch, respectively.
  • Data of level “1" is stored in a memory area assigned at a specific address of the RAM 4 through the IOC 5 in the "Dominical year” mode.
  • data.of level “0” is stored in the memory area.
  • This status is explained by the flow chart of Fig. 11.
  • the dominical year setting switch 9b-l is depressed
  • data of "1" is stored in the memory area assigned at the specific address of the RAM 4.
  • the Showa era setting switch 9b-2 data of "0" is written in the memory area.
  • the CPU 1 discriminates dominical year data from "Showa era” data and executes the leap year compensation routine.
  • year data of time data of the watch circuit 6 may be judged as a dominical year if it is within a range of 81 to (1)05, that is, 1981 to 2005 AD, or as a year in the Showa era if it is within a range of 56 to 80, that is, 1981 to 2005 AD in the flow chart in Fig. 12. If the year data is judged as a year in AD, data of level "1" is written in a memory area assigned at the specific address of the RAM 4. However, if the data is judged as a year in the Showa era, data of level "0" is written in the memory area.
  • year data is automatically judged as year data in the dominical year or in the Showa era. Based on this judgement, time data is compared with dominical leap year data or "Showa era" leap year data. Leap year compensation is automatially performed according to comparison results. Therefore, proper calender information is constantly obtained regardless of years in the dominical or the Showa era.
  • Calender data thus obtained that is, data of year, month and day can be displayed at the display unit 9a or printed on a bill or the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electric Clocks (AREA)
EP82103270A 1981-04-22 1982-04-19 Système pour compensation pendant des années bissextiles Expired EP0063771B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82103270T ATE17892T1 (de) 1981-04-22 1982-04-19 Schaltjahrkompensationssystem.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP56060781A JPS57175278A (en) 1981-04-22 1981-04-22 Leap year correcting circuit of digital timepiece
JP56060782A JPS57175279A (en) 1981-04-22 1981-04-22 Leap year correcting circuit of digital timepiece
JP60782/81 1981-04-22
JP60781/81 1981-04-22

Publications (2)

Publication Number Publication Date
EP0063771A1 true EP0063771A1 (fr) 1982-11-03
EP0063771B1 EP0063771B1 (fr) 1986-02-05

Family

ID=26401839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103270A Expired EP0063771B1 (fr) 1981-04-22 1982-04-19 Système pour compensation pendant des années bissextiles

Country Status (3)

Country Link
US (1) US4447160A (fr)
EP (1) EP0063771B1 (fr)
DE (1) DE3268926D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040047243A1 (en) * 2001-11-09 2004-03-11 Karageorge John Anthony Perpetual solar and seasonal calendar system
KR100542361B1 (ko) * 2003-02-12 2006-01-10 삼성전자주식회사 피피피오이 네트워크 시스템 및 이 시스템의 접속 방법

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333410A (en) * 1965-04-02 1967-08-01 Instr For Industry Inc Electronic clock-calendar
US3797222A (en) * 1971-10-05 1974-03-19 Seiko Instr & Electronics Digital electronic timepiece having a perpetual calendar display device
US3866406A (en) * 1973-02-01 1975-02-18 Time Computer Solid state electronic wristwatch
DE2539225A1 (de) * 1974-09-03 1976-03-11 Suwa Seikosha Kk Uhr mit kalenderanzeige
DE2548511A1 (de) * 1974-10-31 1976-05-06 Citizen Watch Co Ltd Elektronische uhr
US3961472A (en) * 1971-05-03 1976-06-08 Ragen Semiconductor, Inc. Solid state electronic timepiece
US4117657A (en) * 1975-12-10 1978-10-03 Kabushiki Kaisha Suwa Seikosha Electronic timepiece calendar circuit
FR2428872A1 (fr) * 1978-06-12 1980-01-11 Casio Computer Co Ltd Dispositif de commande d'affichage d'une donnee calendrier dans des dispositifs electroniques
EP0008234A1 (fr) * 1978-08-11 1980-02-20 Mackay, Simon Brooke, The Baron Tanlaw Dispositif calendrier électronique
GB2077465A (en) * 1980-06-06 1981-12-16 Casio Computer Co Ltd Compact electronic device having calendar function

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133170A (en) * 1975-04-30 1979-01-09 Casio Computer Co., Ltd. Global timepiece
JPS53110559A (en) * 1977-03-08 1978-09-27 Citizen Watch Co Ltd Electronic watch
JPS6037437B2 (ja) * 1977-03-30 1985-08-26 カシオ計算機株式会社 カレンダ表示装置
JPS5454077A (en) * 1977-10-06 1979-04-27 Seiko Instr & Electronics Ltd Calendar collecting device for analog electronic watch
US4228644A (en) * 1977-11-16 1980-10-21 Citizen Watch Co., Ltd. Display device for calendar timepieces
US4253169A (en) * 1978-02-07 1981-02-24 Salah Ibrahim M Electronic calculation watch with digital display
CH616807B (fr) * 1978-07-10 Berney Sa Jean Claude Piece d'horlogerie electronique comportant un disque d'affichage du quantieme et un affichage analogique de l'heure.
JPS5539081A (en) * 1978-09-14 1980-03-18 Casio Comput Co Ltd Calendar display system
JPS5547472A (en) * 1978-09-30 1980-04-03 Citizen Watch Co Ltd Watch with calendar
JPS5575675A (en) * 1978-12-04 1980-06-07 Seikosha Co Ltd Calender mechanism
US4361874A (en) * 1979-09-20 1982-11-30 Casio Computer Co., Ltd. Schedule table printing apparatus

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333410A (en) * 1965-04-02 1967-08-01 Instr For Industry Inc Electronic clock-calendar
US3961472A (en) * 1971-05-03 1976-06-08 Ragen Semiconductor, Inc. Solid state electronic timepiece
US3797222A (en) * 1971-10-05 1974-03-19 Seiko Instr & Electronics Digital electronic timepiece having a perpetual calendar display device
US3866406A (en) * 1973-02-01 1975-02-18 Time Computer Solid state electronic wristwatch
DE2539225A1 (de) * 1974-09-03 1976-03-11 Suwa Seikosha Kk Uhr mit kalenderanzeige
DE2548511A1 (de) * 1974-10-31 1976-05-06 Citizen Watch Co Ltd Elektronische uhr
US4117657A (en) * 1975-12-10 1978-10-03 Kabushiki Kaisha Suwa Seikosha Electronic timepiece calendar circuit
FR2428872A1 (fr) * 1978-06-12 1980-01-11 Casio Computer Co Ltd Dispositif de commande d'affichage d'une donnee calendrier dans des dispositifs electroniques
EP0008234A1 (fr) * 1978-08-11 1980-02-20 Mackay, Simon Brooke, The Baron Tanlaw Dispositif calendrier électronique
GB2077465A (en) * 1980-06-06 1981-12-16 Casio Computer Co Ltd Compact electronic device having calendar function

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
10e CONGRES INTERNATIONAL DE CHRONOMETRIE, no. 3, September 1979, conference no. E2.1, pages 271-278, Geneve, CH. *
HOROLOGICAL JOURNAL, vol. 116, no. 4, October 1973, pages 3-10, Ashford Kent, G.B. *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 18, no. 8, January 1976, pages 2515-2516, New York, USA *
WIRELESS WORLD, vol. 80, no. 1468, December 1974, pages 491-495, Haywards Heath, Sussex, G.B. *

Also Published As

Publication number Publication date
DE3268926D1 (en) 1986-03-20
US4447160A (en) 1984-05-08
EP0063771B1 (fr) 1986-02-05

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